Asian Journal of Dental Sciences

Implant-supported single-tooth and partial-arch restorations depend heavily on the abutment material selected to connect the fixture to the definitive prosthesis. Titanium has long served as the reference material because of its favourable mechanical strength, corrosion resistance, and extensive longitudinal clinical documentation, whereas zirconia has emerged as the principal alternative when aesthetic demands, thin soft tissue biotypes, or patient preference for a metal-free restoration take priority. This narrative review synthesises the contemporary evidence comparing zirconia and titanium abutments across three interconnected domains: biological performance (soft tissue integration, bacterial adhesion, marginal bone stability, and biocompatibility), mechanical behaviour (fracture resistance, fatigue performance, implant–abutment interface wear, and screw-joint stability), and aesthetic outcomes (soft tissue colour, translucency, and validated aesthetic indices). The literature indicates that titanium abutments retain a measurable mechanical advantage, particularly regarding fracture load, wear at the implant connection, and screw-joint stability, while zirconia abutments consistently outperform titanium in aesthetic parameters and appear to elicit comparable or occasionally lower biofilm accumulation, without conferring a clear or consistent biological superiority once soft tissue thickness is controlled. Two-piece, titanium-base hybrid abutments have emerged as a pragmatic compromise, combining a durable titanium–titanium implant interface with a zirconia coronal structure for aesthetic control. Clinical decision-making should therefore be individualised according to implant location, soft tissue phenotype, occlusal loading, and patient expectations rather than adopting either material as a universal default. Persistent gaps remain in long-term randomised evidence, standardised fatigue-testing protocols, and understanding of the clinical relevance of low-temperature degradation of zirconia under intraoral conditions.